CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 6,208	$ 6,823
Restricted cash	823	603
Accounts receivable, net	3,356	3,271
Current portion of lease receivable	236	252
Costs and estimated earnings in excess of billings on uncompleted contracts	2,813	3,038
Inventories, net	3,762	3,751
Prepaid expenses and deposits	1,063	902
Total current assets	18,261	18,640
Long-term lease receivable, net of current portion	1,023	1,083
Property and equipment, net	4,629	4,638
Goodwill	635	635
Intangible assets, net	0	0
Other assets	1,336	1,222
Total assets	25,884	26,218
Current liabilities:
Accounts payable	1,167	1,158
Accrued liabilities	1,539	1,400
Billings in excess of costs and estimated earnings on uncompleted contracts	6,209	6,500
Customer deposits	2,038	2,238
Current portion of retirement obligations	507	507
Current portion of pension settlement obligation	382	382
Current portion of long-term debt	214	211
Total current liabilities	12,056	12,396
Pension and retirement obligations, net of current portion	4,287	4,344
Pension settlement obligation, net of current portion	4,886	4,886
Long-term debt, net of current portion	1,709	1,764
Deferred rent obligation	1,125	1,231
Total liabilities	24,063	24,621
Stockholders' equity:
Preferred stock,	0	0
Common stock,	2,323	2,323
Additional paid-in-capital	53,680	53,641
Common stock in treasury, at cost,	(3,532)	(3,532)
Accumulated deficit	(48,504)	(48,689)
Accumulated other comprehensive loss	(2,146)	(2,146)
Total stockholders' equity	1,821	1,597
Total liabilities and stockholders' equity	$ 25,884	$ 26,218